MAX7221EWG Maxim Integrated Products, MAX7221EWG Datasheet - Page 5

• Manufacturer Part Number: MAX7221EWG
• Description: LED Drivers
• Manufacturer: Maxim Integrated Products

Specifications of MAX7221EWG

• Number Of Digits: 8
• Number Of Segments: 64
• Low Level Output Current: 320 mA
• High Level Output Current: - 45 mA
• Operating Supply Voltage: 4 V to 5.5 V
• Maximum Supply Current: 330 mA
• Maximum Power Dissipation: 941 mW
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: SOIC-24 Wide
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

2, 3, 5–8,
Serially Interfaced, 8-Digit LED Display Drivers
14–17,
10, 11
20–23
PIN
4, 9
12
13
18
19
24
1
( ) MAX7221 ONLY
SEG A–SEG G,
DIG 0–DIG 7
(MAX7219)
(MAX7221)
_______________________________________________________________________________________
NAME
LOAD
DOUT
GND
ISET
CLK
DIN
LOAD (CS)
CS
DP
V+
SEG A–SEG G, DP
SEGMENT DRIVERS
CLK
DIN
REFERENCE
SEGMENT
CURRENT
Serial-Data Input. Data is loaded into the internal 16-bit shift register on CLK’s rising edge.
Eight-Digit Drive Lines that sink current from the display common cathode. The MAX7219 pulls
the digit outputs to V+ when turned off. The MAX7221’s digit drivers are high-impedance when
turned off.
Ground (both GND pins must be connected)
Load-Data Input. The last 16 bits of serial data are latched on LOAD’s rising edge.
Chip-Select Input. Serial data is loaded into the shift register while CS is low. The last 16 bits of
serial data are latched on CS’s rising edge.
Serial-Clock Input. 10MHz maximum rate. On CLK’s rising edge, data is shifted into the inter-
nal shift register. On CLK’s falling edge, data is clocked out of DOUT. On the MAX7221, the
CLK input is active only while CS is low.
Seven Segment Drives and Decimal Point Drive that source current to the display. On the
MAX7219, when a segment driver is turned off it is pulled to GND. The MAX7221 segment dri-
vers are high-impedance when turned off.
Connect to V
R
Positive Supply Voltage. Connect to +5V.
Serial-Data Output. The data into DIN is valid at DOUT 16.5 clock cycles later. This pin is used
to daisy-chain several MAX7219/MAX7221’s and is never high-impedance.
SET
(LSB)
D0
V+
Resistor and Using External Drivers section).
R
D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 D12
SET
DUAL-PORT
ROM WITH
DD
BYPASS
CODE B
SRAM
8x8
through a resistor (R
8
8
8
8
ADDRESS
REGISTER
DECODER
SET
4
) to set the peak segment current (Refer to Selecting
FUNCTION
DISPLAY-TEST REGISTER
SHUTDOWN REGISTER
SCAN-LIMIT REGISTER
INTENSITY REGISTER
MODE REGISTER
DIGIT DRIVERS
DIG 0–DIG 7
D13 D14 D15
(MSB)
Functional Diagram
Pin Description
DOUT
MODULATOR
MULTIPLEX
CIRCUITRY
INTENSITY
PULSE-
WIDTH
SCAN
8
5